John b



j JOHN n. GRIQUT., OF BiniiiNeijiAM, iviioHiGAN.

MANNER or ecvnRNnvsaHii rem) or ADRILI; on.

` l .M {SUBSrANCEIs BOBER ses METALS., Alu)` oriana .Sreccetali if Letters. eteet Nefs dated April 25,

i To` all whom t may concern Be it known that I, JoHN RfGRonr, of

Birmingham, in the county of `Oakland and State of Michigan, civil engineer, `have in vented a new and useful improvement in the manner of,` governing the feed'of drills oi" borers `for the Adrilling or boring of metals or other articles requiringto be `drilledor` bored andwhich..` may also be applied tol other purposes.; and` Il. do hereby declare that.` the following isa full and exact description:

thereof.

given several exempliiications of the manner `in which the principle upon which the action of my apparatus is dependent `may be advantageously applied, and from which any1` competent machinistwillbe enabled to adapt it to instruments oflother forms. j

Figure l `shows `a "drill and a stock, orl frame, so formed as to suit it to the `drilling of railroad bars, the tire `of wheels, and other i articles which it isiitted to embrace.

A, A, is the frame which is to hold the drill and its appendages. One side of this frame is represented ashaving a hinge joint at A, and a tightening screw at B. The

notches C, C, at the lower end of the frame are intended to embrace the bar, or piece` to be drilled. Under this construction of the instrument it may be applied to a railroad bar without the necessity of removing it from the track; the brokenends, or other part to be drilled being raised sufficiently to pass into the notches C, C.

D, D, is a mandrel or shaft, whichhas a socket in its lower end to receive the drill E.

The mandrel D, hasfa, screw` F, cut upon it which works through. a female screw 11i what I denominate a friction nut, G. The

opening through which it passes in the top` of the frame is not tapped, but isy of such size as to allow the screw to pass easily through it, and it operates therefore as a mere guide to the mandrel, "as `does the cross-bar, or

brace .I-I. The mandrel `may be turnedby means of a winch venient manner.`

The friction nutl I, or in any other con- G, I usually make eccentric; that is, supposing its periphery to be cylindrical, the screw hole through it is bored a little out of the aXis of the cylin` der; or said nut may be made elliptical if preferred. `Theiobject of this eccentricity, or deviation from a cylindrical forni, is to into be subjected; the nut maybe made cylindrical,"with thescrew` through its axis, and

means of a thumbmscrew K. The piece J, is made of steel, and temperedso "as to` possess someelasticity, and 4operate as a i creasethe friction to which its peripheryis i up against lthe periphery ofthe `mit G, by

strong spring, aswell as to make friction.

t t n j j i Between the top of the nut G, and the head In the accompanying drawings I have Aother metal," which `may `be renewed when necessary; thislserves to x protect the fraine and nut from undue friction and wear, and allows the feed `to be more perfectlylregulated by-tliefriction piece. YI n The `operation of this apparatus isas follows. i The nut G, it is manifest, would,` if unobstructed., revolve with the mandrel and were the nut held stationary the `mandrel wouldadvance at every revolution to a distance equal to that of the width of the thread of the screw upon it. By means of the friction piece K,the revolution of the nut G, may be obstructed to any required extent, and such a balance may be established'between the resist-ance produced by the cutting of the drill, or borer, and the :friction` to `which the nutis subjected, as will enablethe operator to govern the feeding with perfect precision; should the article to be bored be hard, the friction on the nut may be increasedso as to compel the drill, or borer, to take hold on it with any degree of force, and should the feed be too rank will instantaneously regulate it.

` Y Figs 2, and, represent the apparatus in the form of a `bench drill, placedhorizontally; Fig. A2, being a side elevatiomand F ig. 3, a top view thereof. I is the base, or bottom plate, by which it may be affixed to `the bench. M, is a sliding standard bored, is to be held; the other parts are lettered as in Fig; `1. j n, Fig. fl is a side elevation of a similar bench drill, in which the friction apparatus is arranged in a` manner differing from that l shown in the other figures. N, is asliding or frictio-n wedge, the face of which is shown at N; which wedge may be made to press with greater or `less force uponthe outer against which the piece to be drilled, `or j face ofthe nut G; this pressure being ing it forward with a yielding pressure;v

such a spring may be applied to the apparatus represented in Figs. l and 2. rPhe parts not peculiar to this arrangement are designated by the saine letters as in the preceding gures. The friction piece J, Figs. l, and 2, may be applied to this instrument, in combination with the spring P, if desired.

Fig. 5 shows a drilling or boring apparatus in the form ofa brace, in which the same principle of action obtains. rIhe part I', in this case takes the place of the winch I, in the other instruments. rPhe mandrel upon which the screw F, is cut is received within a cylindrical hollow case R, having a head S, which may be sustained against a beam, or in any other convenient manner.

J, is the friction piece which may be made to bear with any required degree of force against the nut G, by means of the screw K, which is tapped intothe case R. rIhe friction nut may be applied to mostof the instruments used for drilling and boring,

and these may, in general, be much simplified by its adopt-ion. In lathes,and other similar apparatus, where the feed in drilling, boring or -turning is regulated by a guide screw, and a gearing of cog-wheels and pinions, this gearing may be dispensed with, and my friction nut and friction piece applied so as to give the required feed; which in addition to its simplicity, has the advantage, at the same time, of being self regulating, by yielding to any unusual obstruction.

I-Iaving thus fully described the nature of my invention, and shown the manner in which the same may be carried into operation, what I claim therein as new and desire to secure by Letters Patent, is-' The employment, substantially in the manner, and under the combination herein made known, of a friction nut, and friction piece, so as to operate upon the mandrel, or

regulating screw, or shaft, of a drilling,

borinO' or other machine re uirinU a similar kind of feed; and this I claim whether such v machine be made in either of the forms represented in the accompanying drawings, or in any other where the same principle may be applied by equivalent means.

JOHN It. GROUT. Witnesses WM. H. Bisiioi, Trios. P. J oNiis. 

